.header{
    display: flex;
    justify-content: center;
    position: fixed;
    height:12vh;
    width: 100%;
    top: 0;
    z-index: 99;
    background: url("https://636c-cloud1-3gdjdzeq2e82c09e-1307302008.tcb.qcloud.la/assets/first/head.png?sign=a94652339dd55f48e649da2882f67a17&t=1637755053") no-repeat center;
    background-size: 100% 100%;
    .text{
        position: fixed;
        z-index: 99;
        top: 6vh;
        margin: 0 auto;
        display: block;
        height: 10vh;
        font-size: 30rpx;
        font-weight: bold;
        color: #fff;
        text-align: center;
    }
    
}